--- title: Introduction to Creatives description: A campaign needs a minimum of one Creative to be eligible for ad serving. In Passendo, Creatives are assigned to a format in the same manner that Placements are. This ensures that a Placement only sho --- [Skip to content](https://site.passendo.com/introduction-to-creatives#main-content) English Show submenu for translations ![Passendo\_Secondary\_Logo.png\]](https://site.passendo.com/hs-fs/hubfs/Passendo_Secondary_Logo.png?height=40&name=Passendo_Secondary_Logo.png) - [Default HubSpot Blog](https://site.passendo.com/blog) Open main navigation Close main navigation - [Default HubSpot Blog](https://site.passendo.com/blog) - English Show submenu for translations - Go to passendo.com Go to passendo.com Hello. How can we help you? - There are no suggestions because the search field is empty. 1. [Help Center](https://site.passendo.com/?hsLang=en) 2. [Passendo Ad Server](https://site.passendo.com/passendo-ad-server?hsLang=en) 3. [Creatives](https://site.passendo.com/passendo-ad-server?hsLang=en#creatives) # Introduction to Creatives A campaign needs a minimum of one Creative to be eligible for ad serving. In Passendo, Creatives are assigned to a format in the same manner that Placements are. This ensures that a Placement only shows ads that you have clearly marked to fit the specific format. In other words, you will not be able to place a creative assigned to a 300x250 format on a placement that is set to 600x250. Furthermore, you can only create creatives on a campaign that matches one of the Placement formats currently created in your account. You can have as many Creatives within a campaign as you like. You can even make a mix of native and display creatives on the same campaign. Depending on how the campaign is booked (covered in detail here: [Bookings](https://passendo.atlassian.net/wiki/spaces/SD2/pages/711098369/Bookings)), the system can rotate all Creatives of a format on all Placements in the same format, allowing for very flexible testing and optimisation on CTR, CR, eCPM, etc. on the Creative level. - [Emperor](https://site.passendo.com/emperor?hsLang=en#main-content) - [Account configuration](https://site.passendo.com/emperor?hsLang=en#account-configuration) - [Managing your inventory (SUPPLY)](https://site.passendo.com/emperor?hsLang=en#managing-your-inventory-supply) - [Managing your ads (DEMAND)](https://site.passendo.com/emperor?hsLang=en#managing-your-ads-demand) - [Reporting](https://site.passendo.com/emperor?hsLang=en#reporting) - [Passendo Ad Server](https://site.passendo.com/passendo-ad-server?hsLang=en#main-content) - [Onboarding your media](https://site.passendo.com/passendo-ad-server?hsLang=en#onboarding-your-media) - [Exchange](https://site.passendo.com/passendo-ad-server?hsLang=en#exchange) - [Quick guides](https://site.passendo.com/passendo-ad-server?hsLang=en#quick-guides) - [Bookings](https://site.passendo.com/passendo-ad-server?hsLang=en#bookings) - [Campaigns](https://site.passendo.com/passendo-ad-server?hsLang=en#campaigns) - [Creatives](https://site.passendo.com/passendo-ad-server?hsLang=en#creatives) - [Advertisers](https://site.passendo.com/passendo-ad-server?hsLang=en#advertisers) - [Default HubSpot Blog](https://site.passendo.com/blog) [![passendo logo](https://site.passendo.com/hs-fs/hubfs/Passendo_Primary_Logo-1.png?width=568&height=110&name=Passendo_Primary_Logo-1.png "passendo logo")](http://www.passendo.com) Passendo Help Center Copyright © 2026, Passendo